If you refer to the pictures yes but in reality 10 is fine since you don't install a beacon on both ducts so you could omit to install 2 inserts that won't be used.
Chapter 12, step 68 have your answer. But, basically, the front motors have their connectors facing the back and the back motor has it's connector facing the front.
Reputation over time
It looks like this user hasn't gained any reputation yet.
Once they have, you'll be able to view a graph of their reputation gained over time.
Here's a preview of what the graph will look like:
If you refer to the pictures yes but in reality 10 is fine since you don't install a beacon on both ducts so you could omit to install 2 inserts that won't be used.
Section 11. Accessories, Step 39
This is the right assembly and everything is pictured correctly
Chapter 12, step 68 have your answer. But, basically, the front motors have their connectors facing the back and the back motor has it's connector facing the front.